wehub-resource-sync
110 lines
3.7 KiB
Swift
110 lines
3.7 KiB
Swift
//===----------------------------------------------------------------------===//
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// Copyright © 2025-2026 Apple Inc. and the Containerization project authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//===----------------------------------------------------------------------===//
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#if canImport(FoundationEssentials)
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import FoundationEssentials
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#else
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import Foundation
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#endif
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#if canImport(Musl)
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import Musl
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private let _mount = Musl.mount
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#elseif canImport(Glibc)
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import Glibc
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private let _mount = Glibc.mount
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#endif
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/// `Binfmt` is a utility type that contains static helpers and types for
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/// mounting the Linux binfmt_misc filesystem, and creating new binfmt entries.
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public struct Binfmt: Sendable {
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/// Default mount path for binfmt_misc.
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public static let path = "/proc/sys/fs/binfmt_misc"
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/// Entry models a binfmt_misc entry.
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/// https://docs.kernel.org/admin-guide/binfmt-misc.html
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public struct Entry {
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public var name: String
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public var type: String
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public var offset: String
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public var magic: String
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public var mask: String
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public var flags: String
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public init(
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name: String,
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type: String = "M",
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offset: String = "",
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magic: String,
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mask: String,
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flags: String = "CF"
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) {
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self.name = name
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self.type = type
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self.offset = offset
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self.magic = magic
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self.mask = mask
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self.flags = flags
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}
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/// Returns a binfmt `Entry` for amd64 ELF binaries.
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public static func amd64() -> Self {
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Binfmt.Entry(
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name: "x86_64",
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magic: #"\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x3e\x00"#,
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mask: #"\xff\xff\xff\xff\xff\xfe\xfe\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff"#
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)
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}
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#if os(Linux)
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/// Register the passed in `binaryPath` as the interpreter for a new binfmt_misc entry.
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public func register(binaryPath: String) throws {
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let registration = ":\(self.name):\(self.type):\(self.offset):\(self.magic):\(self.mask):\(binaryPath):\(self.flags)"
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try registration.write(
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to: URL(fileURLWithPath: Binfmt.path).appendingPathComponent("register"),
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atomically: false,
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encoding: .ascii
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)
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}
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/// Deregister the binfmt_misc entry described by the current object.
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public func deregister() throws {
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let data = "-1"
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try data.write(
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to: URL(fileURLWithPath: Binfmt.path).appendingPathComponent(self.name),
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atomically: false,
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encoding: .ascii
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)
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}
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#endif // os(Linux)
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}
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#if os(Linux)
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/// Crude check to see if /proc/sys/fs/binfmt_misc/register exists.
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public static func mounted() -> Bool {
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FileManager.default.fileExists(atPath: "\(Self.path)/register")
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}
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/// Mount the binfmt_misc filesystem.
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public static func mount() throws {
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guard _mount("binfmt_misc", Self.path, "binfmt_misc", 0, "") == 0 else {
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throw POSIXError.fromErrno()
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}
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}
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#endif // os(Linux)
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}
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